Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5d3d80c98c6679…

MALICIOUS

PDF

89.3 KB Created: 2021-09-06 14:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 042211849d63b45553758a6c65be68d7 SHA-1: b355809e60080ab8d7f36ad6264aa60af995913d SHA-256: fc5d3d80c98c6679fe269fd5462738f979ecd13e7da5408cf11ed784f210c000
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://semineebrasov.ro/printuri-fi/files/39514650857.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/25098475390.pdfIn PDF document text
    • http://derma-dts.de/files/file/12955050389.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/fuzopux.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16116f902cfe36---tegojegowowozemozo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161137704514ab---46334170679.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/2447163a42681411cf8ad9ceea98f9f8/78194192687.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/bonogidos.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/xelewusowukawutexo.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/wupikanibejodogonu.pdfIn PDF document text
    • http://domainecomps.com/documents/files/30346152396.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/zurekisewasa.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/28326830605.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/86653716262.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/37837011647.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/3ki6mf0a9qsnh01ntojj38jsi2/30321745989.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/01141701873.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/tiqlpkepce7u97u91ot4fetjk1/25411494280.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608444cf3bb89---ruxuruxipifetolekakeb.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/40655501895.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/73936005803.pdfIn PDF document text
    • http://netflor.pl/upload/File/lobarerasuvo.pdfIn PDF document text
    • https://kildevangen.dk/files/tunodivuxunawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mendeleev+biography+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 10824 bytes
SHA-256: 2626684cfe72426f597b20c467131e162243f4a7901553f384442271e929da8d
font_01_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFD 16744 bytes
SHA-256: 686aa6d31649b60ec742e0dcda008fe2e7aa13569047d97d30931a51bea72912

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